[FFmpeg-cvslog] aaccoder: use roundf() instead of ceilf()

[Rostislav Pehlivanov]

ffmpeg | branch: master | Rostislav Pehlivanov <atomnuker at gmail.com> | Sun Sep  6 15:07:29 2015 +0100| [b9b1fd118347746c87a2be372757a30dc1700a6b] | committer: Rostislav Pehlivanov

aaccoder: use roundf() instead of ceilf()

The specifications explicitly state to use roundf() which
also rounds half-integer values away from zero.
This does fix a few IS artifacts.

Signed-off-by: Rostislav Pehlivanov <atomnuker at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b9b1fd118347746c87a2be372757a30dc1700a6b
---

 libavcodec/aaccoder.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/aaccoder.c b/libavcodec/aaccoder.c
index 86d598f..f265103 100644
--- a/libavcodec/aaccoder.c
+++ b/libavcodec/aaccoder.c
@@ -332,11 +332,11 @@ static void set_special_band_scalefactors(AACEncContext *s, SingleChannelElement
         start = 0;
         for (g = 0;  g < sce->ics.num_swb; g++) {
             if (sce->band_type[w*16+g] == INTENSITY_BT || sce->band_type[w*16+g] == INTENSITY_BT2) {
-                sce->sf_idx[w*16+g] = av_clip(ceilf(log2f(sce->is_ener[w*16+g])*2), -155, 100);
+                sce->sf_idx[w*16+g] = av_clip(roundf(log2f(sce->is_ener[w*16+g])*2), -155, 100);
                 minscaler_i = FFMIN(minscaler_i, sce->sf_idx[w*16+g]);
                 bands++;
             } else if (sce->band_type[w*16+g] == NOISE_BT) {
-                sce->sf_idx[w*16+g] = av_clip(4+log2f(sce->pns_ener[w*16+g])*2, -100, 155);
+                sce->sf_idx[w*16+g] = av_clip(roundf(log2f(sce->pns_ener[w*16+g])*2), -100, 155);
                 minscaler_n = FFMIN(minscaler_n, sce->sf_idx[w*16+g]);
                 bands++;
             }